So I have a paladin who took eldritch heritage and improved eldritch heritage and is now taking greater eldritch heritage. Orc bloodline. I'm taking the ability
Power of Giants (Sp): At 15th level, you may grow to Large size as a standard action. At this size you gain a +6 size bonus to Strength, a –2 penalty to Dexterity, a +4 size bonus to Constitution, and a +4 natural armor bonus. You may return to your normal size as a standard action. You may remain in this size for up to 1 minute per character level per day; this duration does not need to be consecutive, but it must be used in 1 minute increments.
To use this ability Defensively, I'd need to make a concentration check, DC 15+2xSpell level. What's the spell level for this ability?
I don't know that this has ever been answered explicitly. In my personal opinion, if an ability it not 'like a spell' it shouldn't have been categorized as a spell-like ability in the first place, but that of course doesn't solve the problem.
I have seen the suggestion that the level be treated as 1/2 the character level the ability is a acquired at and/or the highest spell level a character of that could cast if he was a 9 level prepared caster, which would come out to seventh level. The ability is similar to, although missing some bits, of Giant Form I, which is a 7th level sorcerer/wizard spell, which is some additional evidence that this isn't a bad answer for that situation.
Perhaps though their has been an official answer I'm not aware of and someone can point you to it.
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Cleric domains, sorcerer bloodlines, wizard schools, and certain other class features give spell-like abilities that aren't based on spells. What's the effective spell level for these abilities?
The effective spell level for these spell-like abilities is equal to the highest-level spell that a character of that class could normally cast at the level the ability is gained.
For example, a 1st-level elemental bloodline sorcerer has elemental ray as a spell-like ability. Because a sorcerer 1's highest-level spell available is 1st, that spell-like ability counts as a 1st-level spell. A 9th-level elemental bloodline sorcerer has elemental blast as a spell-like ability. Because a sorcerer 9's highest-level spell available is 4th, that spell-like ability counts as a 4th-level spell.
posted July 2011 | back to top
7th level spell.
If a character class grants a spell-like ability that is not based on an actual spell, the ability's effective spell level is equal to the highest-level class spell the character can cast, and is cast at the class level the ability is granted.
Unfortunately, this was granted via feats rather than a class ability. That said, since the feats are intended to grant abilities normally associated with a class ability, I'd treat it as a 7th-level spell, just as if a sorcerer had acquired the ability normally at 15th level.